Error when using digital ocean

salt-cloud.digitalocean

Given the below config

ubuntu_do:
  provider: digital_ocean
  image: Ubuntu 12.04 x32 Server
  size: 512MB
  script: Ubuntu
  location: New York 1
  minion:
    master: salt.example.com

When I run
salt-cloud -p ubuntu_do test


I get the following error

[INFO    ] Loaded configuration file: /etc/salt/cloud
[INFO    ] salt-cloud starting
[INFO    ] Creating Cloud VM test
[INFO    ] Rendering deploy script: /usr/local/lib/python2.7/dist-packages/saltcloud/deploy/Ubuntu.sh
[ERROR   ] Failed to create VM test. Configuration value None needs to be set
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/saltcloud/cloud.py", line 467, in create
    output = self.clouds['{0}.create'.format(self.provider(vm_))](vm_)
  File "/usr/local/lib/python2.7/dist-packages/saltcloud/clouds/digital_ocean.py", line 229, in create
    'ssh_key_name', vm_, __opts__, search_global=False
  File "/usr/local/lib/python2.7/dist-packages/saltcloud/clouds/digital_ocean.py", line 429, in get_keyid
    keyid = keypairs[keyname]['id']
KeyError: None
test:
    ----------